Electric elevator



Jan. 30, 1934. J. R. JACKSON. JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet l INVENTOR W 7%: 7(fr 01mm 2 A in U R r w r: l i 5 3 f 4 9 um NHH I IHMHI HWWI HIInunHHINNHIHJ 4 n $1 lllllllllllllllllli U 4. 1 I. Inn nnflfl hn nu hn afll knl hhh lquwu L W 1 t I a r 1 i 4 Jan. 30, 1934. J. R. JACKSON, JR1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 2 IN VEN TOR ATTORNE Y Jan. 30, 1934. J. R. JACKSON, JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 3 INVENTOR:

ATTORNEY Jan. 30, 1934. J. R. JACKSON. JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 5 S2 S1 U/L/DI ATTORNE Y Patented Jan. 30, 1934 UNITED STATES PATENT GFFICE 11 Claims.

The invention to be hereinafter described relates to electric elevatorsystems, and is an improvement upon that shown in my copendingapplication Serial No. 267,716, filed April 5, 1928.

The system of said application is of the push button type in which a carautomatically travels to and is brought to rest at a floor when a personat a floor presses a button, and an up or down travelling car can bestopped at any floor by a person at that floor without depending onstopping of the car by the operator in response to a call.

A supplemental system is provided which may be readily applied toexisting elevator systems without material alteration thereof andwithout interference with ordinary operation of the elevator. Thissupplemental system may be applied to usual electric elevator systemswhether of the rheostatic type or the variable voltage type, both ofwhich are well known forms of electric elevator installations.

The supplemental system includes a panel having contacts thereon in theelevator control circuits, and the construction is such that variationis had in the time required for the car to decellerate to a stop at afloor, taking into account the resultant force urging the car toward afloor due to the weight of the car, the varying load thereon, and thecounter weight. Deceleration should commence at a greater distance froma floor with resultant heavier loads than with resultant lighter loads.This is accomplished by means which is preset in response to operationof a weighing machine in the car.

In said application the weighing machine actuates a selector devicemounted on the elevator car and connected by conductors with a positionmachine in the penthouse actuated by an electric motor which alsoadjusts the contact carrying panel to vary the time allowed for the carto decelerate to a stop at a floor.

A purpose of the present invention is to provide improved means foraccomplishing this regulation. In carrying the invention into practicaleffect, the regulation initiated at the car and transmitted to theadjustable panel in the pent- 'hOuse utilizes an alternating currentself-synchronizing or selsyn system for the transmission of angularmotion.

Another purpose of the invention is to utilize the selsyn motor systemto effect a control which will prevent a fully loaded car from stoppingat floors response to pressure of floor buttons.

With the aforesaid and other purposes in view, the character of theinvention may be best understood by reference to the followingdescription of one good form of electric elevator system shown in theaccompanying drawings, wherein:

Fig. 1 is a vertical section through an elevator system embodying theinvention, some parts being shown in side elevation;

Fig. 2 is a horizontal section through the base of the elevator car,parts being broken away to show the weighing machine suspension in thebase;

Fig. 3 is a vertical transverse section through the car base;

Fig. 4 is a vertical longitudinal section through the car base;

Fig. 5 is an elevation showing the panel of the supplemental controlsystem, one of the selsyn motors and means connecting the same with thepanel for adjusting the latter;

Fig. 6 is the wiring diagram of the selsyn motor system;

Fig. 7 is a conventional diagram of the selsyn motors; and

Figs. 8, 9 and 10 show the wiring diagram and instrumentalitiesassociated therewith of the supplemental system. 80

Referring to the drawings, (Fig. 1) designates the car in the hatchway 2suspended by cables 3 which pass around the drum 5 in the penthouse, andthence downward in the hatchway to the counterweight '7. The drum isdriven by an electric motor 9 provided with a usual brake unnecessary toshow in detail herein.

The elevator car (Figs. 2, 3 and 4) contains a shallow chamber 11 inwhich is mounted a weighing machine comprising a platform 13 whichserves as the car floor. Projecting down from the platform arewedge-shaped lugs 15 resting on seats in yokes l7 and 19 of the weighingmachine suspension, said yokes having ends pivotally mounted on bearings21. The yoke 1'7 has an arm 23 overlying an arm 25 of the yoke 19, saidarms being received by a ring 2'7. A coil spring 29 is interposedbetween the bottom of the base and the arm of the yoke 19, tends to rockthe yokes upward, and is adapted to yield when a load is placed on theplatform. The arm 23 is longer than the arm 25, and has a seat in theunder side thereof engaged by a finger 31 on a rock shaft 33 projectingout beyond a side of the car.

To prevent dirt from reaching and interior ing with proper operation ofthe weighing machine, strips 35 of rubber or other suitable material arefitted into opposed grooves in the base a d g s of the platform.

ill

Fast on the rock shaft 33 are arms 37 (Fig. 1) connected by links 41with a pair of arms 43 on a rock shaft at the top of the car on which issecured a toothed segment 45 meshing with a pinion 47 on the shaft ofone of the selsyn motors 49 mounted on the top of the elevator car.

To look the weighing machine the rock shaft 33 referred to is providedwith a cylindrical enlargement 51, and cooperating therewith are clampshoes 53 carried by levers 55 pivotally mounted on the base andconnected to cores of an electric magnet 57 carried by and locatedbeneath the car base. Coil springs 59 are connected to the levers andbrackets on the base. The construction is such that when the magnet isenergized, the shoes will be released, and when the magnet isde-energized, the springs 59 will become effective to cause the shoes 53to grip the cylindrical enlargement 51 on rock shaft 33 and thereby lockthe weighing mechanism.

The motor 49 referred to, on the top of the car, is the transmittingmotor of the selsyn system. The receiving selsyn motor 61 is located inthe penthouse. These motors are provided with single phase windings 63(Fig. 7) on their rotors or armatures and with polycircuit windings 65',65 and 65 on their stators. The polyphase windings of the two motors maybe similar to a polyphase induction motor or alternating currentgenerating windings. They are here shown as three-phase Y connectedwindings. It will be understood that the armature windings may bemounted on the stators, and the stator windings may be mounted on therotors if desired. The single phase rotor windings are excited from asuitable source of alternating current supply, in the present instanceshown herein as an alternating current generator 67 (Fig. 7) driven byan electric motor 69. The selsyn motors are excited by wires 71 leadingto the rotors of said motors.

The rotor of the transmitting selsyn motor 49 on the car receivesangular motion through the connections described extending from theweighing machine to the armature shaft of said motor. The constructionis such that the motion given to the rotor of the transmitting selsynmotor will be imparted synchronously to the receiving selsyn motor 61 inthe penthouse.

As stated, one of the purposes of this invention is to provide means forvarying deceleration of the car to a stop at a floor, which isaccomplished by means preset in response to operation of the weighingmachine in the car and the selsyn motor system.

In the circuits to be described for the elevator, are sets of contactswhich are mounted on a panel '73 (Figs. 1 and 5) adjacent a controlboard 75 in the penthouse. This panel is mounted on a suitable support77, and at opposite ends of the panel are elongated slots 79 receivingpins 81 on the support. Fast on one end of the slide is a threaded lugor nut 83 receiving a screw shaft 75 which may be rotated by a geartrain 62 and the rotor shaft of the ceiving selsyn motor 61.

The construction is such that the receiving selsyn motor rotor and thescrew shaft will be turned in one direction or the other depending onincrease or decrease in the load on the car, and the panel 73 willreceive adjustments toward the right or left of Fig. 5. The effect ofthis adjustment in varying deceleration of the car to a floor will behereinafter explained.

Referring now more particularly to Figs. 8, 9

and 10, the lines leading from the main control board of the presentsystem comprise in the diagram feed line L, up-direction wire U,downdirection wire D, second speed wire S, and third speed wire SAssuming the elevator car is to travel down, the operator in the carpresses a down button 101 in the car to complete a circuit whichenergizes the magnet 103 and is traced through line wire 105, stopbutton 107, wire 109, down button 101, wire 111, switch 113, contact115, wire 117, contact 119, switch 121, contact 123, wire 125, magnet103, wire 127 and line wire 129. Energization of the magnet 103 movesthe switch 131 into engagement with contacts 133, 135 and 139 which arein circuits similar to those made by the three speed car switch of theusual systems. In the usual system, if the switch engaged two of thesecontacts, one speed would be obtained, if it engaged three contacts, asecond speed would be obtained, and if it engaged four contacts, a thirdspeed would be obtained. In the present system the different speeds arenot obtained in this way. Closing of the switch 131 completes circuitsfor full speed of the car, since deceleration of the car is controlledautomatically by means to be described.

Since down button 101 is pressed momentarily, magnet 103 is made aholding magnet by a shunt around said button including wires 217 and140, contact 140a, switch 421, contact 1401), and wire 1400 leading towire 111.

Now it will be assumed that it is desired to bring the car down to thefirst floor. This is accomplished by pressing a button at the firstfloor in a circuit traced through main line 141, wire 143, contact 145,push button 147 at the first floor, contact 149, wire 151, contact 153,switch 155, contact 157, wires 159 and 161, magnet 153 and wire 165 tomain line 167. Breaking this circuit de-energizes the magnet 163 andallows the switch 155 to open under the influence of gravity. As the carapproaches a floor, a bridge contact carrier 169 is caused by travel ofthe car to reach contact 171. This carrier is mounted on a screw shaft85 (Fig. 5) journalled in bearings on panel 73 referred to. Fast on oneend of the shaft is a worm gear 87 meshing with a worm 89 on a shaft 91carrying a grooved sprocketwhcel 93 connected by a sprocket tape 95 withthe elevator car, the tape being maintained taut by a weighted pulley 97(Fig. 1). As the car travels in the hatchway the tape rotates a sprocketwheel 3, and through the gearing described rotates the screw shaft 85,thereby causing the carrier 169 to move along the panel 75 to the rightor left (Fig. 5) according to the direction of travel of the car.

The contact 169 carries a contact 173 which will engage the contact 171on the board 74, completing a circuit for the down magnet 177 tracedthrough main line 141, wire 179, wire 181, wire 183, contact 185, switch187, contact 189, wire 191, contact 171, contact 173 on carrier 169,wire 193, contacts 100 and 102 at the receiving selsyn motor, wire 193a,switch E, wire 193b, wire 197, magnet 177, wire 199, contact 201, switchcontact 205, wire 207, Wire 209. wire 217, wire 109, stop button 107 inthe car, and line wire 105.

Magnet 177 is now energized, and it moves the switch carrier 219 whichhas thereon switches 221, 223, 225, 227, 229 and 231, all of saidswitches being insulated from one another. The switches 225, 227, 229and 231 are brought respectively into engagement with contacts 233, 235,237 and 239 rub which have current standing thereon respectively throughwires 241, 243, 245 and 247, which respectively lead to contacts 133,13.5, 137 and 139 engaged by switch 131.

When the switch carrier 219 is moved by the magnet 177 as described, itmoves switch 113 referred, out of engagement with contact 115, and thisbreaks the circuit to the down magnet 103. The car is caused to continueto travel by the circuits which include switches 225, 227, 229 and 231which are respectively in engagement with contacts 233, 235, 237 and239. The circuit described for energizing the deceleration controlmagnet 177 was completed by engagement of the contact 173 on carrier 169with contact 171. This condition is momentary, and the magnet 177 nowbecomes a holding magnet through a circuit which is traced through mainline 141, wire 179, wire 180, wire 249, contact 251, switch 221 oncarrier 219, wire 253, contact 255, bridge contact 193 on carrier 169,bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203,contact 205, wires 207, 209, 217 and 109, button 107, and line wire 105.

Next will be described the means for causing the deceleration of the carin coming to its stop. As the car approaches the floor, the carrier 169after causing contact 173 to leave contact 171, will bring bridgecontact 257 on carrier 169 into engagement with three contacts 259, 261and 263, and a bar 265, said contacts being of different lengths. A setof contacts 267, 269 and 271 is provided for another floor, and a set ofcontacts 273, 275, and 277 is provided for still another floor. A set ofsuch contacts will be provided for every floor, three sets being shownherein for three floors for purposes of illustration, and all of saidsets being mounted on the panel referred to. The bridge contact 257 oncarrier 169 cooperates with all of these sets of contacts and bar 265.The bar 265 is connected by wire 279 with switch 22.5 on carrier 219.Contact 263 is connected by wire 231 with switch 227. Contact 261 isconnected by wire 283 with switch 229. Contact 259 is connected by wire285 with switch 231.

As the car approaches its stop, bridge contact 257 on carrier 169 willbe brought into engagement with contacts 259, 261 and 263. The bridgecontact will move along said contacts and leave them in the .ordernamed. When the bridge contact 257 leaves contact 259, it interrupts oneof the circuits for the three speeds of the car driving electric motor.When the bridge contact 257 leaves contact 261, it interrupts another ofsaid circuits, and when bridge contact 257 leaves the contact 263 itinterrupts the final circuit and the deceleration control, and the caris thus brought automatically to rest at the floor.

When the car starts from the floor and is to make a stop at the nextadjacent floor, although the car switch is thrust to full speedposition, there is no time for the motor to build up full speed. On theother hand, when the car starts from the floor and is to make a stop atthe second or third floor eyond, or when the car is running as anexpress, when the car switch is thrust to full speed position, the motorhas suflicient time to build up full speed. When the car is travellingat express speed, -'the first step of deceleration should be initiatedwhen the car is further from the floor than when the car is travellingat local or slower speed. Accordingly, means is provided which isoperable in response to the speed of the car automatically to initiatethe first step of deceleration at a greater distance from the floor whenthe car is running as an express than when the car is running at lowerspeeds. This means includes the governor 286 (Figs. 5 and 10) which maybe located in the penthouse and may be rotated by the sprocket wheel 93referred to, which is driven by the tape 95 connected to the elevatorcar. The worm shaft 91 has a bevel gear 286a thereon meshing with abevel pinion 286?) fast on the governor shaft. The governor has a link2860 connected to a lever 286d pivotally mounted intermediate its endsand having a contact 286a at the outer end thereof. The governor has alink 2% con nected to a lever 286g pivoted intermediate its ends andcarrying a contact 28Gb at the outer end thereof.

Adjacent contact 286a are a pair of contacts 236i and 2861. The contact2862' is connected to a wire 273, and a branch wire 273a leads therefromto a contact 273?) adjacent the end of the contact 273 referred to. Thecontact 2367' is connected to a wire 2%, and a branch wire 274a leadstherefrom to a contact 27 11) adjacent the contact 2731). A wire 276tapped from wire 285 leads to the governor actuated contact 286a. Branchwires 276a and 27Gb lead from wire 276 to contacts 267 and 273respectively.

The construction is such that at low speed the governor actuated contact286e will engage both of the contacts 286i and 2367', and the bridgecontact 257 on carrier 169 will not initiate the first step ofdeceleration until said contact has left contact 274%). When the car isrunning as an express, the governor will have moved the contact 286e outof engagement with the contacts 236i and 2867, thereby interrupting thecircuits includ ing the contacts 273?) and 274b, and the first stage ofdeceleration will be initiated earlier, that is, when the bridge contact257 leaves the contact 273, and the car is at a greater distance fromthe floor.

When the car is running as an express, the circuits including both. ofthe contacts 27319 and 27 112 will be broken, but when the car isrunning at a slower speed, the circuit including the contact 2732) willnot be broken, and deceleration will be initiated when the car is nearerthe floor. When the car is running at a still slower speed, the circuitsincluding both of the contacts 273!) and 27 1b will be closed, anddeceleration will be initiated when the car is still nearer the floor.

The deceleration control has been described in respect to one of thefloors, but it will be understood that it is the same for all of thefloors. While for purposes of illustration two contacts have been shownadjacent each contact 259, 267 and 273 in circuits controlled by thegovernor for varying the distance from the floor in initiatingdeceleration to stop, it will be understood that any number of suchcontacts in circuits controlled by the governor may be employeddepending upon the high speed of the car.

The circuit for the down magnet 103 includes the switch 121 and contacts119 and 123, the arrangement being such that this circuit is broken onenergization of the up-direction magnet 469, to be referred to.Similarly, the up-direction magnet cannot be energized when thedown-direction magnet is energized.

Next will be described the circuit controlled by the button at thesecond floor for bringing the ear to a stop at that floor. This circuitincludes wire 287 leading from line wire 1 11, contact 239, second floorpush button 291, contact 293, wire 295, contact 297, switch 299, contact301, wires 303 and 305, magnet 307, wire 309 and line wire 167.

Before the second floor button 291 is pressed, the magnet 307 is inenergized condition and the switch 299 is closed. When this button ispressed, the circuit to the magnet is broken, and the switch 299 opensunder the influence of gravity. This initiates the operations alreadydescribed for bringing the car to a stop at the second flour. Thecircuit for accomplishing this is traced through main wire 141, wire179, wire 181, wire 311, contact 313, switch 315, contact 317, wire 319,contact 321, contact 173, wire 193, contacts 100 and 102 at thereceiving selsyn motor, wire 193a, switch E, wire 193b, wire 197, magnet177, wire 199, contact 201, switch 203, contact 205, Wires 207, 209, and217, stop button 107, and line wire 105.

Next will be described the circuit controlled by the button at the thirdfloor for bringing the car to a stop at that floor. This circuit istraced through wire 323 leading from line wire 141, contact 325, thirdfloor push button 327, contact 329, wire 331, contact 333, switch 335,contact 337, wires 339 and 341, magnet 343, wire 345 and line wire 167.Before the third floor push bulton is pressed the circuit is completedand the magnet 343 is in energized position, and the switch 335 isclosed. When the button is pressed the circuit is broken, the magnet isde-energized, and the switch 335 opens under the influence of gravity.On opening of the switch 335, a circuit is completed which is tracedthrough line wire 141, wires 179, 181 and 347, contact 349, switch 351,contact 353, wire 355, contact 357, contact 173, wire 193, contacts 100and 102 at the receiving selsyn moior, wire 193a, switch E, wires 193band 197, magnet 177, wire 199, contact 201, switch 203, contact 205,wires 207, 209, 217 and 109, stop button 107 and line wire 105.

Means is provided for completing the circuits for the floor magnets, andenergizing said magnets so as to close the switches which were opened bypressing the floor buttons. This is done so that after a floor buttonhas been pressed to bring the car to a stop, any additional pushing ofiioor buttons will not deenergize said magnets. Also, this means resetsthe swifches so as to be ready for calls after the car has left thefloor to which it is called. Said means for the first floor magnetincludes a circuit traced through line wire 141, wire 179, wire 180,contact 359, switch 223 on carrier 219, wire 361, bar 363, bridgecontact 365, contact 367, wire 369, wire 161, magnet 163, wire 165, andline wire 167. When this circuit is completed by engagement of bridgecontact 365 with bar 363 and contact 367, the first floor magnet 163 isenergized, and the switch 155 is closed, thereby completing the circuitthrough the push button 147 as well as through the circuit justdescribed, so that the magnet 163 becomes a holding magnet, and startingof the car and movement of the bridge contact 365 away from contact 367leaves the magnet in energized condition and through the floor buttoncircuit only.

To energize the second floor magnet 307 independently of the push buttoncircuit and close the switch 299, a circuit is provided traced throughline wire 141, wire 179, wire 180. contact 359, switch 223, wire 361,bar 363, bridge contact 365, contact- 371 wire 375, wire 305, magnet307, wire 309, and line wire 167. This energizes the second floor magnetand closes the switch 299 and holds the switch closed independently ofthe push button circuit. When the car starts, the contact 365 leavescontact 371, and the switch is held closed by the circuit which includesthe second floor push button.

The circuit for energizing the third floor magnet 343 and closing theswitch 335 independently of the push button circuit is traced throughline wire 141, wire 179, contact 359, switch 223, wire 361, bar 363,bridge contact 365, contact 373, wire 375, wire 341, magnet 343, wire345 and line wire 167. This circuit energizes the magnet 343 and closesthe switch 335 independently of the push button. When the car starts andthe bridge contact 365 moves away from the contact 373, the magnet isheld energized and the switch is held closed by the circuit whichincludes the third floor push button.

When the switch 219 has been closed by the magnet 177 to decclera'te andstop the car at the second floor, a circuit is completed which is tracedthrough line wire 141, wire 179, wire 180, wire 249, contact 251, switch221, wire 253, contact 255, wire 377, contact 379, bridge contact 193,bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203,contact 205, wires 207, 209, 217 and 109, stop button 107, line wire105. Movement of bridge contact 193 out of engagement with contact 379interrupts the circuit, deencrgizes the magnet 177 and allows the switchcarrier 219 to open, thereby interrupting the circuits which bring thecar to rest.

he circuits for the magnet 177 controlling deceleration of the car tothe stop at the third floor is traced through line wire 141, wire 179,wire 180, wire 249, contact 251, switch 221, wire 253. wire 377, contact381, bridge contact 193, bar 195, wire 197, magnet 177, wire 199,contact 201, switch 203, contact 205, wires 207, 209, 217 and 109, stopbutton 107 and line wire 105. When the bridge contact 193 moves awayfrom contact 381, the circuit just described is interrupted, the magnet177 is de-energized, and the switch carrier 219 opens, therebyinterrupting the circuits which bring the car to rest at the thirdfloor.

When the down magnet 177 is energized, the switch carrier 219 is movedso as to throw the switch 113 out of engagement with the contact 115,thereby interrupting the circuit to the downdirection magnet 103. Thisallows switch 131 to open, thereby interrupting the main feed lines forcausing down-travel of the car, and these circuits are now completedthrough the switches 225, 227, 229 and 231 on the carrier 219. When thecircuits are set for up-travel of the car, the down-direction magnet17'? cannot be energized, since its circuits are broken by switch 203.

To enable the operator in the car to stop the down-travel car at anyfloor, push buttons 401, 102 and 403 are provided in the car. completedby pressing button 401 through line wire 141, wire 17.9,wi1'e 333, wire384, contact push button 401, contact 307, wire 389, contact 391, bridgecontact 193, bar 105, wire 197, magnet 177, wire 199, contact 201,switch 203, contact 205, wires 207, 209, 217 and 109, stop button 107,and line wire 105.

Next will be described the circuit completed by pressing button 402 thecar to bring the downtravel car down to a stop at the second floor.

This circuit is traced through line wire 141, wire 179, wire 333, wire384, contact push button 402, contact wire 2307, contact 399, bridgecontact 193, bar 19.", wire 197, magnet 3.77, wire 199, contact 201,switch 203, contact 205, wires The circuit is traced 207, 209 217 and109, stop button 107 and line wire 105.

The circuit completed by pressing button 403 to bring the down-travelcar to rest at the third floor, is traced through line wire 141, wire179, wire 383-, wire 384, contact 406, button 403, contact 408, wire405, contact 407, bridge contact 193, bar 195, wire 197, magnet 177,wire 199, contact 201, switch 203, contact 205, wires 207, 209, 217 and109, stop-button 107, and line wire 105.

Pressing any one of buttons 401, 402 and 403 will complete a circuitwhich energizes the magnet 177 and causes deceleration of the car aspreviously described. This circuit for said magnet is completed when thebridge contact 193 is in engagement with any one of the contacts 391,399 and 407, and the car is in a stopping zone. Engagement of the bridgecontact 193 with any one of the contacts 391, 397 and 407 is momentary,and is interrupted before the car comes to a rest, in order to energizethe magnet 177 momentarily and close the switch carrier 219. The circuitto the magnet 177 is completed independently of the engagement of thebridge contact 193 with contacts 391, 399 and 407 through the circuitincluding the switch 221 on carrier 219 as already described.

The circuits and instrumentalities for causing the car to travel up inthe hatchway are similar to those described for down-travel of the car,and it is not thought necessary to describe these circuits andinstrumentalities, but that it will be sufficient to mark them withreference numerals which shall be the same as those already used forcorresponding parts, with the exception that number 4 will be theinitial number of each reference, as for example, the up-directionmagnet corresponding to the down-direction magnet 103 is designated4103. Then on re-reading the description for down-travel of the car withreference to these higher numbers, ready understant ing can be had ofthe circuits and instrumentalities for up-travel of the car.

When the car is to be run as an express, the operator can open theswitches E in the circuits for the down and up magnets 177 and 4177,thereby cutting out stopping of the car by pressure of the buttons atfloors.

When the car is fully loaded, the rotor of the receiving selsyn motorwill have turned sufficiently to cause an arm 409 (Fig. 9) thereon torock a switch 411 carrying contacts 102 and 4102 to move themrespectively away from contacts 100 and 4100, thereby breaking circuitswhich prevent response of the car to calls for stops from buttons atiloors.

By this invention simple and efficient means is provided for adjustingthe contacts in the electric circuits controlling the speeds ofdeceleration of the car to stops at floors. To accomplish this, the onlyconnect ons required between the elevator car and the mechanism in thepenthouse is the wiring from the transmitting selsyn motor on the car tothe receiving selsyn motor in the penthouse.

It will be understood that the invention is not limited to the specificembodiment shown, and that various deviations may be made therefromwithout departing from the spirit and scope of the appended claims.

What is claimed is:

1. In an el vator, the combination of a car, an electric motor forcausing the car to travel in the elevator hatchway, and means forregulating the automatic speed changes of deceleration of the car tostops at floors including a selsyn motor system having transmitting andreceiving motors, and means for turning the rotor of the transmittingmotor to present the system prior to travel of the car.

2. In an elevator, the combination of a car, an electric motor forcausing the car to travel in the elevator hatchway, and means forcontrolling deceleration of the car to stop at floors includingdifferent speed motor circuits having contacts, a bridge contact carriermoved by travel of the car to and past said contacts, and meansincluding a selsyn motor system controlled from the car to adjust saidcontacts, thereby to initiate deceleration of the car at varyingdistances from a floor.

3'. In an elevator, the combination of a car, an electric motor forcausing the car to travel in the elevator hatchw'ay, and means forcontrolling deceleration of the car to floors including a panel havingsets of contacts thereon including a set for each floor for up -traveland a set for each floor for down-travel of the car, each of said setshaving graded contacts, a pair of contact carriers, means actuated bytravel of the car for moving one of the carriers past the up-travelcontact sets, and for moving the other carrier past the down-travelcontact sets, difierent speed motor circuits including said contactsets, and means including a selsyn motor system for adjusting said panelto increase or decrease the distance of approach of the carriers to saidsets according to increase or decrease in the resultant car load.

4. In an elevator, the combination of a car, an electric motor forcausing the car to travel in the elevator hatchway, and means forcontrolling the automatic speed stages of deceleration of the car tostops at floors including means on the car for weighing the loadthereon, a panel having sets of contacts thereon including a set foreach floor for up-travel and a set for each floor for downtravel of thecar, each of said sets having graded contacts, a pair of contactcarriers, means actuated by travel of the car for moving one of thecarriers past the up-travel contact sets, and for moving the othercarrier past the down-travel contact sets, electric circuits for thedifferent motor speeds of deceleration including said contact sets, andmeans including a selsyn motor system controlled by the weighing meansautomatically to adjust the panel, thereby to increase or decrease thedistance of approach of the carriers to said sets according to increaseor decrease in the car load.

5. In a push button electric elevator, the combination of buttons atfloors for up and down travel of the car, means operable on pressure ofa selected up or down push button to cause the car to travel to and stopat the floor of that button, and means for regulating occurrence of theautomatic speed stages of deceleration of the car to stops at floors,including a selsyn motor system having its transmitting motor mounted onthe car, a weighing machine, and means for imparting motion from theweighing machine to the rotor of the transmitting motor.

6. In a push button electric elevator, the combination of a car, anelectric motor for causing the car to travel in the elevator hatchway,buttons located at floors, means operable on pressure of a selectedbutton for causing the car to travel to and stop at a floor, weighingmeans on the car for weighing the load thereon, and means for regulatingoccurrence of the automatic speed stages of deceleration of the car tostops at floors including a selsyn motor system adapted to be set inaccordance with variations in the load on the weighing means, and meansactuated by said selsyn motor system for preventing the car fromresponding to calls to floors when fully loaded.

7. In a push button electric elevator, the combination of a car, anelectric motor for causing the car to travel in the elevator hatchway,buttons located at floors, means operable on pressure of a selectedbutton for causing the car to travel to, and stop at a floor, includingmeans for causing the car automatically to decelerate to said floor,weighing means on the car for weighing the car load, means including aselsyn motor system controlled by the weighing means having transmittingand receiving motors for regulating occurrence of the initiation of theautomatic deceleration of the car to stops at floors, and means actuatedby the receiving motor for preventing the car from responding to callsto floors when fully loaded.

8. In an elevator system, the combination of an elevator car, a drivingmotor for the elevator car, means for controlling deceleration of thecar to stop the car at floor landings including different speed motorcircuits, means for controlling the operation of the different motorcircuits to initiate deceleration of the car at varying distances fromthe floor landings, a selsyn motor system operative from the car foractuating said control means for the difierent speed motor circuits, andmeans for operating said selsyn motor system in accordance with the loadon the car.

9. In an electric elevator system, an elevator car, a driving motor forthe elevator car, control circuits for the driving motor, includingmeans for starting the driving motor and different speed motor circuitsfor decelerating the motor as the car approaches a floor landing, pushbuttons located at the floor landings for initiating the operation ofsaid motor control circuits, means for controlling the operation of thedifferent speed motor circuits to initiate deceleration of the car atvarying distances from the floor landings, means including a selsynmotor system operative from the car for actuating said control means forthe different speed motor circuits and means for operating said selsynmotor system in accordance with the load on the elevator car.

10. In an electric elevator system, an elevator car, a driving motor forthe elevator car, control circuits for the driving motor, includingmeans for starting the driving motor and different speed motor circuitsfor decelerating the m0- tor as the car approaches a floor landing, pushbuttons located at the floor landings for initiating the operation ofsaid motor control circuits, means for controlling the operation of thedifferent speed motor circuits to initiate deceleration of the car atvarying distances from the floor landings, means including a selsynmotor system operative from the car for actuating said control means forthe different speed motor circuits, means for operating said selsynmotor system in accordance with the load on the elevator car, and meansactuatable by said selsyn motor system for preventing the car fromresponding to floor calls when fully loaded.

11. In an elevator system, the combination of an elevator car, a drivingmotor for the elevator car, call buttons at the various floor landings,means responsive to the actuation of a call button for decelerating andstopping the car, means for controlling the response of the deceleratingand stopping means to the actuation of a call button, a selsyn motorsystem operative from the car for actuating said control means, andmeans for operating said selsyn motor system when the car is fullyloaded to prevent the car from responding to floor calls.

JOSEPH R. JACKSON, JR.

